[issue10089] Add support for arbitrary -X options

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

I suggest using sys._xoptions to make it clearer that this is for CPython specific internal implementation runtime tweaks. We're putting it in sys so *we* can get at it, not applications.

(It also makes it clear that other implementations aren't obliged to implement *any* particular interface to the -X options. Requiring that would go against the whole spirit of -X)

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